A long time ago, I worked as a bartender. Rules for checking ID's were very strict. If cops showed up and ever found anyone under age, there were serious penalt

A long time ago, I worked as a bartender. Rules for checking ID's were very strict. If cops showed up and ever found anyone under age, there were serious penalties. So yes, even if there's a fake only once every two weeks, or whatever you consider to be once in a "blue moon" -- that is the purpose of the system. Believe me, bars don't check ID's because they want to. They do it because the legal consequences are extremely serious otherwise, and "but the ID looked real to our bouncer" isn't a defense, hence the scanning. There's nothing naive. I think you just aren't familiar with the laws around this.